考虑磁阻传感器设计中的非均匀电流分布及其对电阻传递函数的影响
Considering non-uniform current distributions in magnetoresistive sensor designs and their implications for the resistance transfer function
摘要：
本文研究了圆盘形自由层自旋阀的非均匀电流分布。在自旋阀的情况下，涡旋状态，这是在许多盘形磁体的基态，允许不同的平行通道的高和低电阻率。因此，读出电流能够避开高电阻率区域，而有利于低电阻率区域，从而产生“导电不均匀性”。因此，自旋阀的总电阻并不总是精确地对应于自由层的总平均磁化。此外，电阻传递函数可以显着影响的电极的空间放置，引起的“几何不均匀性”。由此产生的偏差从电阻磁化传递函数进行了研究，为不同的自旋阀的几何形状，并比较可比设备的测量。
英文摘要：
Non-uniform current distributions of spin valves with disk shaped free layers are investigated. In the context of spin valves, the vortex state, which is the ground-state in many disk shaped magnetic bodies, allows for distinct parallel channels of high and low resistivity. The readout current is thus able to evade high resistivity regions in favor of low resistivity regions, giving rise to 'conductive inhomogeneities'. Therefore, the total resistance of the spin valve does not always correspond exactly to the total average magnetization of the free layer. In addition, the resistance transfer function can be significantly influenced by the spatial placement of the electrodes, giving rise to 'geometric inhomogeneities'. The resulting deviations from resistance to magnetization transfer function are investigated for different spin valve geometries and compared to measurements of comparable devices.
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